The Pokemon Locations below are only SOME of the places to find the listed Pokemon.

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Treecko = Petalburg Woods

Torchic = Fiery Path

Mudkip = Route 119

Poochyena = Route 1 (Night) + Route 104

Zigzagoon = Route 1 + Route 104

Wurmple = Viridian Forest + Petalburg Woods

Lotad = Route 6 + Route 114 (Waters)

Seedot = Route 6 + Route 114

Taillow = Route 2 + Route 104

Wingull = Most Water Routes

Ralts = Route 102 or Route 103

Surskit = Route 4 (Morning) + Route 102

Shroomish = Route 11 (Morning) + Route 118

Slakoth = Route 44 + Petalburg Woods

Nincada = Route 5 + Route 116

Whismur = Mt. Moon + Rusturf Tunnel

Makuhita = Mt. Moon + Mt. Mortar

Nosepass = Mt. Moon + Union Cave

Skitty = Route 38 + Safari Zone

Sableye = Pokemon Tower + Bell Tower + Sky Pillar

Mawile = Sky Pillar + Cave of Origin

Lairon = Victory Road

Meditite = Route 26 + Midwood Forest

Electrike = Midwood Forest + New Mauvile

Plusle = Route 5 + Route 110

Minun = Route 5 + Route 110

Volbeat = Routes 24, 43, 117

Illumise = Routes 24, 43, 117

Roselia = Route 11 + Route 117

Gulpin = Route 110 + Midwood Forest

Carvanha = Route 118 + Route 119 (via Old Rod)

Wailmer = Various Water routes

Numel = Route 13 Cave + Route 112

Torkoal = Route 16 + Fiery Path

Spoink = Route 13 Cave + Jagged Pass

Spinda = Route 44 + Route 113

Trapinch = Dragon's Den

Cacnea = ???

Swablu = Dragon's Den + Route 114

Zangoose = Route 6 + Route 114

Seviper = Route 6 + Route 114

Lunatone = Mt. Moon + Meteor Falls

Solrock = Mt. Moon + Meteor Falls

Barboach = Route 17 + Route 114 via Old Rod

Corphish = Route 13 (Old Rod) + Route 117 (Good Rod)

Baltoy = ???

Lileep = Pewter City Fossil Garden

Anorith = Pewter City Fossil Garden

Feebas = Route 13 + Route 118 (via Good Rod)

Castform = Given at Weather Institute

Kecleon = Route 24 + Route 123

Shuppet = Bell Tower + Mt. Pyre

Duskull = Bell Tower + Mt. Pyre

Tropius = Route 39 + Route 120

Chimecho = Route 24 + Route 43

Absol = Safari Zone, Dark Cave, Ice Path

Snorunt = Seafoam Islands

Spheal = Seafoam Islands

Clamperl = Safari Zone + Route 132 (via Super Rod)

Relicanth = ???

Luvdisc = Safari Zone + Route 132 (via Super Rod)

Bagon = Dragon's Den + Meteor Falls

Beldum = Moss Rock + New Mauville